Educational apparatus.



EDUCATIONAL APPARATUS.

APPLICATION EILED AUG. 24,1904.

2 SHEETS-SHEET 1.

'No. 791,709.v PATENTEDLVJUNEG, 1905.

R. M. MBILI.

EDUCATIONAL APPARATUS; APPLICATION-FILED AUG. 24,1904.

2 SHEETSSHEET 2- Patented June 6, 1905.

PATENT OFFICE.

RUDOLF M. MEILI, OF LUOOA, NORTH DAKOTA.

EDUCATIONAL APPARATUS- SPEOIFIGATION forming part of Letters Patent No. 791,709, dated June 6, 1905.

' Application filed August 24, 1904. Serial No. 221,970.

To aZZ whom it may concern. r

Be it known that I, RUDoLE M. MEILI, a citizen of theUnited States, residing atLucca, in the county of Barnes, State of North Dakota, have invented certain new and useful Improvements in Educational Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. s

This invention relates to devices for teaching astronomy, and has for its object to provide a cheap and simple article with which the rudiments may be explained.

The invention will be fully understood from 1 the description hereinafter given, taken in connection with the annexed drawings, forming a part of this specification, the same symbols of reference designating the same parts or features, as the case may be,wherever they occur.

' Of the drawings, Figure 1 is a face view of the device complete. Fig. 2 is a similar view with the front disk consisting of an astronomical chart removed. Fig. 3 is a view similar to Fig. 1, but with the parts in different positions.

Referring now to the drawings, the present device comprises, first, a ground or base card 1; second, a half-disk of colored or shaded card 2; third, a half-disk of white card 3, and, fourth, a disk of transparentor translucent material 4, having a chart of a hemisphere of the earth with one of the geographical poles forming the center. The half-disks 2 and 3 and the disk4 are pivoted at theircenters upon the base-disk 1, and the half-disks 2 and 3 are provided with round extension-pieces 5 and g 6, respectively, extending beyond the circle of 'eac ,the former extension-piece representing the moon and the latter the sun.

In the useof the present device the parts representing the sun and moon are shifted pivotally and half-disks are correspondingly moved to indicate the portions of the earth from which the sun and moon, respectively, are visible.

i What is claimed is 1.' A device for teaching the rudimental principles of astronomy as they are related to the sun, moon and earth, consisting of a base-card, a colored half-disk representing the shadows of the moon, a white half-disk representing one-half of the suns light on the earth, and a translucent or transparent disk composing a hemisphere of the globe, said dis ;1 and half-disks being pivoted on the basecar 2. A device for teaching the rudimental principles of astronomy as they are related to the sun, moon and earth, consisting of a base-card, a colored half-disk representing the shadows of the moon, a White half-disk representing one-half of the suns light on the earth, and a translucent or transparent disk composing a hemisphere of the globe, said disk and half-disks being pivoted on the basecard, combined with two extension pieces extendin beyond the circle each connected with the half-disks and indicating the moon and sun, respectively.

In testimony whereof I affix my signature in presence of two witnesses.

RUDOLF M. MEILI. Witnesses:

H. E. BLAIR, H. V. Fox. 

